Ship control system wide integration and the use of dynamic simulation techniques in the Fremm project

Balsamo

et al. 2021

JMSE

The article deals with a simulation approach to the representation of the ship motions in waves, interacting with the propulsion system behavior (diesel engine and propeller). The final goal is the development of a simulator, as complete as possible, that allows the analysis of the main engine thermodynamics in different sea conditions, also in the unfavorable event of dynamic instability of the hull, and the correct management of the other propulsion components. This latter aspect is particularly interesting in some of the last new energy solutions for decarbonization of ships, concerning, for example, auxiliary electric motors, powered by batteries, to support the traditional diesel-mechanical propulsion (especially in heavy weather conditions). From this point of view, a proper analysis of the engine dynamic performance, affected by particular sea states, is fundamental for a smart management and control of shaft generators/auxiliary electric motors, batteries, etc. To this end, the work presents and highlights the main features of a ship simulator, suitable for the study of the new propulsion solutions that are emerging in maritime transport. Some representative results will point out the complex non-linear behavior of the propulsion plant in waves. Moreover, a parametric roll scenario will be investigated, in order to highlight the capability of the conceived simulator in modeling the effects of the dynamic instability of the hull on the propulsion plant.

Section: Introductionmentioning

confidence: 99%

Simulation Modeling of a Ship Propulsion System in Waves for Control Purposes

Acanfora

Balsamo

et al. 2021

JMSE

“…The advantages of the system are explained through the results of an energy efficiency analysis, carried out in the several propulsion modes allowed by the flexibility of the hybrid propulsion [11], [12], [13], and [14].…”

Section: Introductionmentioning

confidence: 99%

Energy efficiency analysis of a flexible marine hybrid propulsion system

2020 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM)

Campora

Vigna

2020

The paper analyses some advantages of the hybrid ship propulsion, enhanced by the use of some energy recovery technologies. The concept design of a power plant for a Ro-Ro ferry is presented as a case study, since this particular ship can best take advantage of the operational flexibility of this propulsion type. As an element of innovation, the hybrid propulsion flexibility is analysed taking into account the installation onboard of dual fuel engines. This leads to examine the influence of natural gas, being rather different from traditional diesel oil in performance and price, on the propulsion system efficiency and fuel cost saving. Moreover, technical solutions as the waste heat recovery from the exhaust gas of the engine, equipped with innovative hybrid turbochargers, are also considered to produce additional electric energy, improving the overall efficiency of the vessel.

“…For ship propulsion controller development and tuning [1][2][3], or for crew training purposes [4][5][6], it is essential to have reliable simulators that are able to predict in real time the behaviour of all the system components involved (engine, mechanical power transmission, propeller, rudder, hull, etc.). In the last fifteen years, the authors have gained experience in the use of Real Time Hardware in the Loop (RT HIL) simulation for the design of the propulsion control systems of important Italian vessels [1][2][3]7]. RT HIL simulation consists of an in-test setup where the real hardware controller can exchange data with the ship propulsion models (mainly the engine and propeller) that are simulated in real-time.…”

Section: Introductionmentioning

confidence: 99%

A Diesel Engine Modelling Approach for Ship Propulsion Real-Time Simulators

Campora

Figari

et al. 2019

JMSE

A turbocharged diesel engine numerical model, suitable for real-time ship manoeuvre simulation, is presented in this paper. While some engine components (mainly the turbocharger, intercooler and manifolds) are modelled by a filling and emptying approach, the cylinder simulation is based on a set of five-dimensional numerical matrices (each matrix is generated by means of a more traditional thermodynamic model based on in-cylinder actual cycle). The new cylinder calculation approach strongly reduces the engine transient computation time, making it possible to transform the simulation model into a real-time executable application. As a case study, the simulation methodology is applied to a high speed four stroke turbocharged marine diesel engine, whose design and off design running data are available from the technical sheet. In order to verify the suitability of the proposed model in real-time simulation applications, a yacht propulsion plant simulator is developed. Numerical results in ship acceleration and deceleration manoeuvres are shown, reducing the simulation running time of 99% in comparison with the corresponding in-cylinder actual cycle engine model.